Seneca Quarry, Historic quarry in Montgomery County, United States
The Seneca Quarry spans across the north bank of the Potomac River, featuring remains of a stone cutting mill and preserved structural elements.
The quarry operated from 1785 to 1901, providing red sandstone for numerous structures including the Smithsonian Castle and Chesapeake and Ohio Canal locks.
The site represents early American industrial heritage through its stone cutting techniques and architectural contributions to Washington D.C.'s development.
Visitors can reach the quarry via River Road and Riley's Lock Road, with parking available near the restored quarry master's house.
The sandstone extracted from this quarry changes color from lilac grey when first cut to a distinctive rust red through weathering.
Location: Montgomery County
Inception: 1785
Elevation above the sea: 98 m
Address: 13201 Tschiffely Mill Rd, Poolesville, MD 20837 20837
GPS coordinates: 39.07750,-77.35389
Latest update: September 23, 2025 14:24
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